Run the Bitwarden SDK's live end-to-end tests against Vaultwarden (#7953)

* Add a test seeder behind the unsafe_test_mode feature

For the end-to-end tests: with the feature, /test/seeder answers the calls the
SDK's live tests make to a seeder API (POST /seed with SingleUserScene or
TestVectorUserScene, DELETE /seed/<playId>), behind HTTP basic auth from
TEST_SEEDER_USERNAME and TEST_SEEDER_PASSWORD, and 404 without them.

It creates accounts without any checks, so no release build has the feature.
CI builds and tests it with sqlite.

* Run the SDK live tests against the test seeder

tools/sdk-live-tests/run.sh builds the server with unsafe_test_mode and runs
the live tests of the SDK's e2e/wasm suite. For SDK versions whose tests log in
to one given account, each user test vector with a master password is seeded
with its vault on a fresh server; for versions that seed their own accounts,
the tests get the seeder's address. Every vector runs, then a summary.

The workflow runs it by hand, and on changes to the seeder or the runner.

* Run the SDK live tests daily

* Test the published SDK package by default in the SDK live tests

src/main.rs

@@ -577,9 +577,19 @@ async fn launch_rocket(pool: db::DbPool, extra_debug: bool) -> Result<(), Error>
         .limit("data-form", 525.megabytes()) // This needs to match the maximum allowed file size for Send
         .limit("file", 525.megabytes()); // This needs to match the maximum allowed file size for attachments
 
+    let rocket = rocket::custom(config);
+    #[cfg(feature = "unsafe_test_mode")]
+    let rocket = {
+        warn!(
+            "This build has `unsafe_test_mode`: its test seeder at /test/seeder creates accounts without any checks. \
+            Never use it outside of tests!"
+        );
+        rocket.mount([basepath, "/test/seeder"].concat(), api::test_seeder_routes())
+    };
+
     // If adding more paths here, consider also adding them to
     // crate::utils::LOGGED_ROUTES to make sure they appear in the log
-    let instance = rocket::custom(config)
+    let instance = rocket
         .mount([basepath, "/"].concat(), api::web_routes())
         .mount([basepath, "/api"].concat(), api::core_routes())
         .mount([basepath, "/admin"].concat(), api::admin_routes())